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As far as I'm aware, it's not longer valid CSS and won't be supported in Firefox, Opera or Safari

There possibly might be a JavaScript way of doing it but I wouldn't bother personally as it's likely to confuse users.

It's also something that was heavily used five or six years ago so if that's the look you're going for then stick a few dancing skeleton's, flaming logo's, marquee's and animated gif's on your page for good measure

The scrollbar is part of the browser and not part of the web page. That code is IE proprietary and will only work in IE and Opera and only there if the browser owner allows it. IE has that option on by default and Opera has it off by default and there is no real reason for Opera users to turn it on while there are good reasons for IE users to turn it off and so you can expect that the effect will only be seen by some of the IE users who visit your site (mainly those too new to the web to know how to turn that off).